Internal thread rolling system

Abstract

The invention discloses an internal thread rolling system, and relates to the related technical field of thread machining, the internal thread rolling system comprises a machine tool and a cantilever arranged on the machine tool, one end of the cantilever is connected with a hydraulic unit, the other end of the cantilever is provided with mounting seats, the mounting seats are provided with rollers through rotating shafts, and the number of the mounting seats is two. The two mounting seats are symmetrically arranged on the two sides of the cantilever in the radial direction; the two mounting seats are arranged and are symmetrical in position, when the two rolling wheels roll the root of the internal thread at the same time, force counteracting on the cantilever can be mutually balanced, single-side stress is avoided, and therefore the uniformity of rolling deformation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to thread processing, in particular to an internal thread rolling system. Background Art

[0002] As is well known, threads are formed on the inner or outer surface of a cylindrical or conical shape. Internal and external threads work together to connect, fasten, transmit motion, or seal, and are widely used in mechanical parts. Threads can be formed by turning, milling, or tapping.

[0003] Some mechanical equipment works in a high temperature and high pressure environment and has harsh operating conditions. To ensure its reliability and service life, the arc of the thread root used to connect the parts must be cold rolled and strengthened. That is, after the thread is turned, a special rolling tool is used with a gold roller to roll the arc of the thread root to ensure that the deformation of the tooth root is ≥0.05. The measurement method is to use a tooth height gauge to compare the tooth height values ​​before and after rolling.

[0004] For example, the patent with announcement number CN119328031A and announcement date January 21, 2025, and named "A flexible rolling tool and rolling method for thread bottom", includes a rolling cutter head, an electromagnet device, a pressure sensor, an outer shell and an inner shell, wherein: the electromagnet device is connected to the inner shell by screws, and the outer shell is slidably connected to the inner shell; the rolling cutter head includes a gasket, a rolling wheel, two bearings, a rolling core shaft, a pressure plate and a fork frame, the fork frame is an inverted T-shaped structure as a whole, and the upper end is a U-shaped structure, and the two ends of the rolling core shaft are respectively installed on the left and right sides of the U-shaped structure through bearings; the rolling wheel is mounted on the rolling core shaft; a gasket is arranged between the right side of the rolling wheel and the bearing; the pressure plate is in contact with the bearing and is connected to the fork frame by screws.

[0005] The shortcoming of the existing technology is that when the root of the external thread is cold rolled to strengthen the thread, the installation cantilever of the roller does not need to be very long to meet the rolling requirements, but when the internal thread is cold rolled to strengthen the thread, the roller needs to enter the inner surface of the cylinder or cone, so the installation cantilever needs to be lengthened. In this way, the cantilever length is insufficient in rigidity, resulting in uneven rolling deformation. Summary of the Invention

[0006] The purpose of the present invention is to provide an internal thread rolling system to solve the technical problems in the related art. In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] An internal thread rolling system includes a machine tool and a cantilever arranged on the machine tool. One end of the cantilever is connected to a hydraulic unit, and the other end is provided with a mounting seat. A roller is mounted on the mounting seat through a rotating shaft. There are two mounting seats, and the two mounting seats are symmetrically arranged on both sides of a radial direction of the cantilever.

[0008] As mentioned above, a linkage mechanism is provided between the two mounting seats. When the two mounting seats are moved by the force of the hydraulic unit, the two mounting seats move the same distance based on the linkage action of the linkage mechanism.

[0009] As mentioned above, the cantilever is provided with a pressure detection gauge for detecting pressure changes of the hydraulic unit.

[0010] As mentioned above, the rotating shaft includes a middle section connected to the roller and two side sections connected to the mounting seat. The two side sections are slidably plugged in the axial direction of the middle section. Based on the extrusion effect of the internal thread tooth side, the roller moves in the axial direction.

[0011] As mentioned above, the mounting seat includes a main seat arranged for sliding on the cantilever and two sub-seaters arranged for sliding on the main seat, and each sub-seater is connected to a side segment; in the stroke of the roller rolling the thread bottom, the two sub-seaters and the roller are inserted into the thread in sequence along the axial direction, and a first elastic member is provided between the middle segment and the side segment.

[0012] As mentioned above, along the sliding direction of the main seat, the side segment is slidably arranged on the corresponding sub-seat, and in the sliding direction, a second elastic member is provided between the side segment and the sub-seat, and a locking mechanism is provided on the sub-seat. When the two sub-seats and the roller are inserted into the thread in sequence along the axial direction and abut against the bottom of the tooth, the locking mechanism locks the side segment on the sub-seat.

[0013] As mentioned above, the locking mechanism includes a trigger block slidably arranged on the sub-seat and a pressure block slidably arranged in the sub-seat, a third elastic member is provided between the pressure block and the sub-seat, a plurality of locking rods are provided on the pressure block, a support is installed at one end of the edge section connected to the sub-seat, and a plurality of locking grooves are provided on the support. When the sub-seat enters the thread, the trigger block is hindered by the bottom of the thread and squeezes the pressure block in the reverse direction, and the locking rod is plugged into the locking groove.

[0014] As mentioned above, in the axial direction, when the thread bottom is rolled, the thread bottom abutted by the pressure block away from the cantilever is not rolled, and the thread bottom abutted by the pressure block close to the cantilever is rolled.

[0015] As mentioned above, the surface of the trigger block in contact with the thread bottom is arc-shaped, and when the trigger block abuts against the thread bottom, the center of the arc-shaped surface of the trigger block is coaxial with the center of the thread.

[0016] As mentioned above, in the axial direction, inclined guide surfaces are provided on both sides of the surface where the trigger block contacts the thread bottom.

[0017] The beneficial effect of the present invention is that by setting two mounting seats and positioning them symmetrically, when the two rollers roll the bottom of the internal thread at the same time, the forces reacting on the cantilever can be balanced with each other, avoiding unilateral force, thereby improving the uniformity of rolling deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of an internal thread rolling system provided in an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a cantilever three-dimensional structure of an internal thread rolling system provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic plan view of the internal structure of a working end body of an internal thread rolling system provided in an embodiment of the present invention;

[0022] Figure 4 This is an exploded schematic diagram of the internal structure of a working end body of an internal thread rolling system provided in an embodiment of the present invention;

[0023] Figure 5 A schematic cross-sectional view of a locking rod and a locking groove of a locking mechanism of an internal thread rolling system provided in an embodiment of the present invention when not plugged in;

[0024] Figure 6 A schematic cross-sectional view of a locking rod and a locking groove of a locking mechanism of an internal thread rolling system provided in an embodiment of the present invention when the locking rod and the locking groove are not fully inserted;

[0025] Figure 7 A schematic cross-sectional view of a locking rod and a locking groove of a locking mechanism of an internal thread rolling system provided in an embodiment of the present invention when fully engaged;

[0026] Figure 8 This is a schematic diagram comparing the planar structures of the workpiece's internal thread bottom before and after rolling.

[0027] Description of reference numerals:

[0028] 1. Machine tool; 10. Chuck; 11. Base; 12. Cantilever; 13. Working end body; 14. Moving groove; 15. Cavity; 16. Pressure gauge; 2. Linkage mechanism; 20. Piston block; 21. Linkage rod; 3. Mounting seat; 30. Main seat; 31. Sub-seat; 4. Rotating shaft; 40. Middle section; 41. Side section; 42. Support; 5. Roller; 6. Locking mechanism; 60. Trigger block; 600. Guide surface; 61. Pressure block; 62. Locking groove; 63. Locking rod; 64. Channel; 7. Workpiece; 8. Internal thread; 80. Unrolled tooth bottom; 81. Rolled tooth bottom; 82. Tooth side; 83. Deformation. DETAILED DESCRIPTION

[0029] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1 To the attached Figure 8 The present invention is further described in detail.

[0030] In an embodiment of the present invention, an internal thread rolling system is provided, including a machine tool 1 and a cantilever 12 arranged on the machine tool 1, one end of the cantilever 12 is connected to a hydraulic unit, and the other end is provided with a mounting seat 3, and a roller 5 is mounted on the mounting seat 3 through a rotating shaft 4. The number of the mounting seats 3 is two, and the two mounting seats 3 are symmetrically arranged on both sides of a radial direction of the cantilever 12.

[0031] Specifically, the machine tool 1 is provided with a chuck 10 (this is the prior art and will not be described in detail), which is used to clamp the workpiece 7 that needs to be rolled on the thread bottom, and to clamp and align the workpiece 7 with threads. The chuck 10 is provided at the power output end of the drive motor. A base 11 is slidingly provided on the machine tool 1, and a cantilever 12 is installed on the base 11. The movement of the base 11 is achieved by a screw transmission mechanism (this is the prior art and will not be described in detail). One end of the cantilever 12 is connected to a hydraulic unit, which is used to provide rolling force for the roller 5 to roll the thread bottom. The other end of the cantilever 12 is provided with a working end body 13 through a bolt, and a moving groove 14 for the mounting seat 3 to slide is provided in the working end body 13. The sliding trajectory of the mounting seat 3 in the moving groove 14 is a straight line. The mounting seat 3 slides in the movable groove 14 in the direction of approaching or moving away from the thread. A roller 5 is rotatably mounted on the mounting seat 3 through the rotating shaft 4. When the oil circuit switch of the hydraulic unit is turned on, the hydraulic oil of the hydraulic unit will generate a force on the mounting seat 3 during the flow. The pre-pressure is set according to actual requirements, thereby providing rolling force for the roller 5 to roll the thread bottom. However, in the prior art, when the tooth bottom of the external thread is cold rolled and strengthened, the cantilever 12 does not need to be too long to meet the rolling requirements, while when the internal thread 8 is cold rolled and strengthened, the roller 5 is required to enter the inner surface of the cylinder or cone, and the cantilever 12 needs to be lengthened. In this way, there will be a problem of insufficient rigidity of the cantilever 12, resulting in uneven rolling deformation 83.

[0032] Based on the above problems, in this embodiment, the number of mounting seats 3 is set to two, and the positions are symmetrically arranged in a certain radial direction of the cantilever 12, that is, the movable groove 14 is arranged through a certain radial direction of the working end body 13, and the two mounting seats 3 are at both ends of the movable groove 14. The space between the two mounting seats 3 is connected to the hydraulic oil flow pipeline of the hydraulic unit, that is, the inner wall of the cantilever 12 is provided with a cavity 15 for the flow of hydraulic oil, which can transport the hydraulic oil to the space between the two mounting seats 3 inside the working end body 13. By utilizing the incompressible nature of the liquid, when the roller 5 rolls the bottom of the internal thread, the hydraulic unit can provide a stable force, and cooperate with the two rollers 5 to roll the bottom of the internal thread at the corresponding position, thereby providing uniformity of the rolling deformation amount 83 of the internal thread bottom.

[0033] The rolling process for the internal thread root of the workpiece 7 should not exceed three times, so as to avoid excessive deformation of the material. Because the material will continue to accumulate deformation during the multiple rolling processes, when the deformation amount 83 exceeds the plastic deformation limit of the material, it may cause cracks or microcracks in the material, especially in stress concentration areas such as the thread root. Secondly, it can also reduce the wear of the roller 5. In this embodiment, when the two rollers 5 are rolling the internal thread root, their positions are not completely symmetrical, but they roll the internal thread root one after the other, that is, the roller 5 located in front rolls the internal thread root for the first time, and the roller 5 located in the back rolls the internal thread root for the second time. In this way, the cantilever 12 completes the rolling process of the internal thread root twice during the first movement along the axial direction of the internal thread 8, which can better improve the rolling effect of the internal thread root.

[0034] According to the structural characteristics of the internal thread 8, that is, the tooth position of the internal thread 8, the arrangement of the roller 5 can be adjusted according to actual needs, such as the tilt angle, rolling direction, etc. In this embodiment, the arrangement of the roller 5 is only one of them. This is the existing technology and will not be elaborated on here. In addition, the number and arrangement of the roller 5 in this embodiment are only one of them. In the optional embodiment, the number of rollers 5 is at least two, and they are evenly arranged in the circumference of the working end body 13, so as to achieve the balance of forces in all directions. The roller 5 is made of alloy. When rolling the bottom of the internal thread, the surface of the roller 5 can be polished or lubricated to reduce the friction between the roller 5 and the internal thread 8. The hydraulic unit is an external small hydraulic station, which provides a stable rolling force for the roller 5 to roll the bottom of the internal thread. After the rolling of the bottom of the internal thread is completed, the measurement method is to use a tooth height gauge to compare the tooth height values ​​before and after rolling.

[0035] The beneficial effect of this embodiment is that by setting two mounting seats 3 and positioning them symmetrically, when the two rollers 5 roll the bottom of the internal thread at the same time, the forces reacting on the cantilever 12 can be balanced with each other, avoiding unilateral force, thereby improving the uniformity of the rolling deformation 83.

[0036] Furthermore, a linkage mechanism 2 is provided between the two mounting seats 3 . When the two mounting seats 3 are moved by the force of the hydraulic unit, the two mounting seats 3 move the same distance based on the linkage action of the linkage mechanism 2 .

[0037] Specifically, since the hydraulic oil of the hydraulic unit is fluid and tends to flow to a position with lower pressure, the moving distances of the two rollers 5 should be basically consistent according to the requirement of the rolling deformation amount 83 of the internal thread root to reduce the error. Therefore, in this embodiment, a linkage mechanism 2 is provided between the two mounting seats 3 to ensure that the two mounting seats 3 maintain a basically consistent displacement distance when subjected to the force of the hydraulic unit, that is, the linkage mechanism 2 includes a piston block 20 arranged axially in the cavity 15 inside the cantilever 12, and a dynamic seal is formed between the piston block 20 and the cavity 15 to prevent the hydraulic oil from flowing into the working end body 13, that is, the cooperation between the piston block 20 and the cavity 15 is similar to that of the active element of an automobile engine. The cooperation between the plug and the cylinder is the same. This is the existing technology and will not be described in detail. Power is transmitted between the piston block 20 and each mounting seat 3 through a linkage rod 21. One end of the linkage rod 21 is hinged to the mounting seat 3, and the other end is hinged to the piston block 20. The two linkage rods 21 form a V-shaped structure. When the hydraulic oil flows to push the piston block 20 toward the working end body 13, the piston block 20 pushes the two mounting seats 3 respectively through the two linkage rods 21, and the two mounting seats 3 move away from each other. Therefore, the moving distance of the piston block 20 is certain, and the swing angles of the two linkage rods 21 are basically the same, so the displacement distances of the two mounting seats 3 are also basically the same, which can ensure that the rolling deformation 83 of the internal thread bottom is uniform.

[0038] Preferably, the cantilever 12 is provided with a pressure detection gauge 16 for detecting changes in the pressure of the hydraulic unit; specifically, the pressure detection gauge 16 can constantly monitor the changes in the hydraulic oil pressure in the cavity 15 of the cantilever 12, thereby better providing a force for the roller 5 to roll the bottom of the internal thread. The pressure detection gauge 16 is a prior art, and its working principle will not be described in detail here.

[0039] In an optional embodiment, the rotating shaft 4 includes a middle section 40 connected to the roller 5 and two side sections 41 connected to the mounting seat 3. The two side sections 41 are slidably inserted in the axial direction of the middle section 40. Based on the extrusion effect of the tooth side 82 of the internal thread 8, the roller 5 moves in the axial direction.

[0040] Specifically, in the prior art, the rotating shaft 4 and the roller 5 are either fixedly connected or rotationally connected, and the rotating shaft 4 and the mounting seat 3 are either rotationally connected or fixedly connected. When the parts in the rolling system are worn, there is a problem of contact wear between the roller 5 and the tooth side 82 of the internal thread 8 during the process of the roller 5 abutting the bottom of the internal thread. Therefore, in this embodiment, the rotating shaft 4 connected to the roller 5 is made into a split structure, that is, it is divided into a middle section 40 fixedly connected to the roller 5, and two side sections 41 axially slidingly inserted at both ends of the middle section 40, and the side section 41 is rotationally connected to the mounting seat 3. In this way, when the roller 5 is squeezed by the tooth side 82 of the internal thread 8, it can move along the axial direction of the rotating shaft 4. As the depth inside the thread increases, the rolling wheel can more accurately abut the tooth bottom part of the internal thread 8.

[0041] Furthermore, the mounting seat 3 includes a main seat 30 slidably arranged on the cantilever 12 and two auxiliary seats 31 slidably arranged on the main seat 30, and each auxiliary seat 31 is connected to a side segment 41; in the stroke of the roller 5 rolling the thread bottom, the two auxiliary seats 31 and the roller 5 are inserted into the thread in sequence along the axial direction, and a first elastic member is provided between the middle segment 40 and the side segment 41.

[0042] Specifically, for ease of description and understanding, the thread is in the form of a spiral column. When it is axially cut, it can be found that the thread is divided into multiple spiral column sections. In this embodiment, the section of the thread corresponding to the roller 5 is named the middle section, and the two sections of the thread corresponding to the front and rear of the middle section are named the front section and the rear section.

[0043] The mounting seat 3 is a 匚-shaped structure with its opening facing the internal thread 8, and then it is set into a split structure, that is, the main seat 30 of the mounting seat 3 is hinged with the corresponding linkage rod 21, and the two sub-seats 31 are arranged on the main seat 30 for sliding along the axial direction of the rotating shaft 4, that is, a slide groove is provided on the main seat 30, and a slider connected to the sub-seat 31 is provided in the slide groove. When the roller 5 does not enter the internal thread 8, based on the elastic force of the first elastic member, the roller 5 is in the middle position between the two sub-seats 31. In the process of the roller 5 abutting the bottom of the internal thread, the roller 5 In the embodiment, the two sub-seats 31 can be plugged into the front section and the rear section one after the other. During the plugging process, as the roller 5 rolls the tooth bottom, the two sub-seats 31 will also slide along the thread track of the internal thread 8, and the distance between the sub-seat 31 and the roller 5 can remain basically unchanged. Then the force exerted by the first elastic member on the roller 5 can make the roller 5 basically in the middle position between the two sub-seats 31. In this way, in the process of the roller 5 rolling the internal thread tooth bottom, it can basically only contact the tooth bottom, reducing the friction loss between the tooth side 82.

[0044] In an optional embodiment, along the sliding direction of the main seat 30, the edge segment 41 is slidably arranged on the corresponding auxiliary seat 31, and in the sliding direction, a second elastic member is provided between the edge segment 41 and the auxiliary seat 31, and a locking mechanism 6 is provided on the auxiliary seat 31. When the two auxiliary seats 31 and the roller 5 are axially inserted into the thread in sequence and abut against the bottom of the tooth, the locking mechanism 6 locks the edge segment 41 on the auxiliary seat 31.

[0045] Specifically, a slideway is provided on the sub-seat 31, and a slide seat is provided in the slideway. The side section 41 is rotatably connected to the slide seat on the corresponding sub-seat 31. The sliding direction of the slide seat in the slideway is consistent with the sliding direction of the main seat 30 in the movable groove 14. The elastic force of the second elastic member causes the slide seat to always tend to move away from the main seat 30. That is, after the roller 5 abuts against the bottom of the internal thread, the movement of the roller 5 is restricted. Then, the continued movement of the main seat 30 will cause the roller 5 and the sub-seat 31 to move relative to each other, and the sub-seat 31 gradually abuts the tooth bottom of the corresponding position. Since the front section has not been rolled by the roller 5, that is, the unrolled tooth bottom 80, the middle section 40 is being rolled by the roller 5, and the rear section has been rolled by the roller 5, that is, the rolled tooth bottom 81. There is a height difference between the unrolled tooth bottom 80 and the rolled tooth bottom 81, that is, the deformation amount 83. Therefore, the tooth bottoms abutted by the two sub-seats 31 are different, and the depths of the two sub-seats 31 extending into the internal thread 8 are also different, that is, when the roller 5 rolls the tooth bottom, in the direction of travel, the sub-seats located on the roller 5 are different. The distance that the front sub-seat 31 extends into the internal thread 8 and abuts the tooth bottom is smaller than the distance that the sub-seat 31 located behind the roller 5 extends into the internal thread 8 and abuts the tooth bottom, while the distance that the sub-seat 31 located behind the roller 5 extends into the internal thread 8 and abuts the tooth bottom is consistent with that of the roller 5, thereby ensuring that the rolling operation of the internal thread tooth bottom can be carried out smoothly. Therefore, in the process of the roller 5 from abutting the tooth bottom that has not been rolled to abutting the tooth bottom that has been rolled, the two sub-seats 31 also gradually abut their respective corresponding tooth bottom parts synchronously, and then pass through the tunnel. The mechanism locks the slide in the slideway to ensure that the roller 5 can smoothly roll the internal thread bottom. When the two sub-seats 31 are in contact with the corresponding tooth bottom, the distance between the sub-seat 31 and the roller 5 is basically consistent with the pitch of the internal thread 8. Compared with using the elastic force of the first elastic member to make the roller 5 in the middle position between the two sub-seats 31, in the method of this embodiment, the position of the roller 5 is less likely to change during the process of the roller 5 rolling the internal thread bottom, so as to better reduce the wear between the roller 5 and the tooth side 82.

[0046] Preferably, the locking mechanism 6 comprises a trigger block 60 slidingly arranged on the secondary seat 31 and a pressure block 61 slidingly arranged in the secondary seat 31, a third elastic member is arranged between the pressure block 61 and the secondary seat 31, the pressure block 61 is provided with a plurality of locking insertion rods 63, the edge segment 41 is provided with a support 42 at one end connected with the secondary seat 31, the support 42 is provided with a plurality of locking grooves 62, in the threaded stroke of the secondary seat 31, the trigger block 60 is reversely extruded by the thread bottom, and the locking insertion rods 63 are inserted into the locking grooves 62.

[0047] Specifically, the trigger block 60 is slidingly arranged on the corresponding secondary seat 31, the sliding direction is consistent with the sliding direction of the primary seat 30 in the moving groove 14, the sliding direction of the pressure block 61 in the secondary seat 31 is perpendicular to the sliding direction of the trigger block 60, and the sliding direction of the pressure block 61 in the secondary seat 31 is also perpendicular to the sliding direction of the sliding seat in the sliding channel, the trigger block 60 and the pressure block 61 are extruded by wedge-shaped cooperation, and the pressure block 61 is provided with a third elastic member between the pressure block 61 and the secondary seat 31, that is, based on the elastic force of the third elastic member, the pressure block 61 has a tendency to reversely extrude the trigger block 60 away from the secondary seat 31, wherein the edge segment 41 is provided with a support 42 at one end connected with the secondary seat 31, that is, the support 42 and the sliding seat are an integral structure, a plurality of locking grooves 62 are arranged on the side of the support 42 corresponding to the pressure block 61, and the corresponding side of the pressure block 61 corresponding to the locking grooves 62 is also provided with a plurality of locking insertion rods 63, the locking grooves 62 and the locking insertion rods 63 are structurally matched, that is, in the process of the secondary seat 31 extending into the corresponding internal thread 8, the trigger block 60 is preferably abutted with the thread bottom, reversely moves on the secondary seat 31 under the obstruction of the thread bottom, extrudes the pressure block 61, so that the pressure block 61 approaches the support 42, when the locking insertion rods 63 are inserted into the corresponding locking grooves at this time, the relative movement of the roller 5 and the secondary seat 31 is limited, then the trigger block 60 abuts with the thread bottom at the corresponding position instead of the secondary seat 31, and then the mounting seat 3 and the roller 5 are equivalent to an integral structure, and are subjected to the hydraulic force of the hydraulic unit together to roll the thread bottom of the internal thread 8.

[0048] When the roller 5 is worn and the rolling deformation 83 is insufficient, the bottom of the internal thread reversely squeezes the pressure block 61 close to the cantilever 12, causing the mounting seat 3 to react on the hydraulic unit as a whole, and the value of the pressure detection gauge 16 increases abnormally, which can be used to judge the degree of wear of the roller 5. When the wear degree of the roller 5 reaches a certain value, or when the edge is suddenly damaged or missing, the value of the pressure detection gauge 16 will be larger, and the roller 5 needs to be replaced. In addition, the internal thread 8 needs to be protected during the process of the value on the pressure detection gauge 16 increasing. That is, a channel 64 is provided on the auxiliary seat 31 behind the roller 5 for the pressure block 61 to move along the moving direction of the main seat 30. That is, in the aforementioned embodiment, the locking groove 62 and the locking rod 63 are not fully connected, and when the roller 5 rolls the bottom of the internal thread, the reaction force applied to the support 42 will not cause the pressure block 61 to move away from the support 4 2, that is, the locking groove 62 will not exert a force on the locking rod 63 along the moving direction of the pressure block 61, but when the locking rod 63 and the locking groove 62 are not fully inserted, if the trigger block 60 is squeezed by an external force again, that is, the deformation amount 83 of the roller 5 rolling the internal thread bottom becomes smaller, the internal thread bottom will exert an extrusion effect on the trigger block 60, which will exert a wedge-shaped extrusion on the pressure block 61, so that the pressure block 61 drives the locking rod 63 and the locking groove 62 from incomplete insertion to complete insertion. When the locking rod 63 and the locking groove 62 are fully inserted, the pressure block 61 and the channel 64 will be aligned, and the trigger block 60 continues to exert a force on the pressure block 61, causing the pressure block 61 to move along the channel 64, so that the pressure block 61 will drive the roller 5 away from the internal thread bottom, thereby protecting the internal thread 8, and then the hydraulic unit removes the hydraulic force on the mounting seat 3, and the staff can replace the roller 5. The pressure block 61 located in front of the roller 5 will also be driven to move by the roller 5 , and the auxiliary seat 31 located in front of the roller 5 is also provided with a channel 64 for the pressure block 61 to move along the moving direction of the main seat 30 .

[0049] Preferably, the surface of the trigger block 60 in contact with the thread bottom is arc-shaped, and when the trigger block 60 abuts against the thread bottom, the center of the arc-shaped surface of the trigger block 60 is coaxial with the center of the thread; specifically, the arc-shaped surface on the trigger block 60 can reduce the wear between the trigger block 60 and the corresponding thread bottom when the trigger block 60 abuts against the thread bottom.

[0050] Preferably, in the axial direction, inclined guide surfaces 600 are provided on both sides of the surface where the trigger block 60 contacts the thread bottom; specifically, the guide surface 600 and the tooth side 82 of the internal thread 8 can form a wedge fit, so that the trigger block 60 can abut the tooth bottom more accurately.

[0051] The above descriptions of certain exemplary embodiments of the present invention are provided by way of illustration only. It is understood that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the present invention.

Claims

1. An internal thread rolling system, comprising a machine tool and a cantilever mounted on the machine tool, wherein one end of the cantilever is connected to a hydraulic unit and the other end is provided with a mounting seat, on which a roller is mounted via a rotating shaft, characterized in that: The number of the mounting seats is two, and the two mounting seats are symmetrically arranged on both sides of a radial direction of the cantilever.

2. The internal thread rolling system according to claim 1, characterized in that: A linkage mechanism is provided between the two mounting seats. When the two mounting seats are moved by the force of the hydraulic unit, the two mounting seats move the same distance based on the linkage action of the linkage mechanism.

3. The internal thread rolling system according to claim 1, characterized in that: The cantilever is provided with a pressure detection gauge for detecting pressure changes of the hydraulic unit.

4. The internal thread rolling system according to claim 1, characterized in that: The rotating shaft includes a middle section connected to the roller and two side sections connected to the mounting seat. The two side sections are slidably plugged in the axial direction of the middle section. Based on the extrusion effect of the internal thread tooth side, the roller moves in the axial direction.

5. The internal thread rolling system according to claim 4, characterized in that: The mounting seat includes a main seat arranged for sliding on the cantilever and two auxiliary seats arranged for sliding on the main seat, each of which is connected to a side segment; during the stroke of the roller rolling the thread bottom, the two auxiliary seats and the roller are inserted into the thread in sequence along the axial direction, and a first elastic member is provided between the middle segment and the side segment.

6. The internal thread rolling system according to claim 5, characterized in that: Along the sliding direction of the main seat, the side segment is slidably arranged on the corresponding sub-seat, and in the sliding direction, a second elastic member is provided between the side segment and the sub-seat, and a locking mechanism is provided on the sub-seat. When the two sub-seats and the roller are inserted into the thread in sequence along the axial direction and abut against the bottom of the tooth, the locking mechanism locks the side segment on the sub-seat.

7. The internal thread rolling system according to claim 6, characterized in that: The locking mechanism includes a trigger block slidably arranged on the sub-seat and a pressure block slidably arranged in the sub-seat, a third elastic member is provided between the pressure block and the sub-seat, a plurality of locking rods are provided on the pressure block, a support is installed at one end of the edge section connected to the sub-seat, and a plurality of locking grooves are provided on the support. When the sub-seat enters the thread, the trigger block is hindered by the bottom of the thread and squeezes the pressure block in the reverse direction, and the locking rod is plugged into the locking groove.

8. The internal thread rolling system according to claim 7, characterized in that: In the axial direction, when the thread bottom is rolled, the thread bottom abutted by the pressure block far away from the cantilever is not rolled, and the thread bottom abutted by the pressure block close to the cantilever is rolled.

9. The internal thread rolling system according to claim 7, characterized in that: The surface of the trigger block in contact with the thread bottom is arc-shaped, and when the trigger block abuts against the thread bottom, the center of the arc-shaped surface of the trigger block is coaxial with the center of the thread.

10. The internal thread rolling system according to claim 9, characterized in that: In the axial direction, inclined guide surfaces are provided on both sides of the surface where the trigger block contacts the bottom of the thread.

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